Getting started with the Reader Monad in C++

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La sessione

Functional programming (FP) has successfully entered C++ via the Range-v3 library / C++20 Ranges. This technical session looks at a more advanced aspect of functional programming, namely monads. Monads in functional programming fulfill a great range of functionalities and the Reader Monad, presented in this talk, roughly models the dependency injection idiom in C++.

In the first part of the talk, I will provide an overview of monads in general, their functionalities, and equivalents in C++. Next, I will present the interface of the Reader monad and its uses in real-world scenarios such as the dependency injection. This will be followed by an implementation of the Reader monad in terms of generic lambda expressions. Here I will clarify what constitutes a monad and what the particulars of the Reader monad are. Finally, we will use our implementation in conjunction with concrete input arguments.

If time allows, we will go through exercises that involve generic nested lambda expressions useful for rolling out your very own monads.

Prerequisites: To follow the talk, It helps if you can interpret basic generic nested lambda expressions. You don’t need to know about monads. No external library will be used. The presented code will work under any C++14 supporting compiler.

Il relatore

Ruzena Gurkaynak. I am the founder of Walletfox.com, a functional programming specialist, and the author of the book Fully Functional C++ with Range-v3. I have 15+ years of experience in developing desktop-based applications in Qt / C++ with the predominant focus on 2D computer graphics. I admire the work of Edsger W. Dijkstra and believe in unassuming explanations, especially in C++. I am always happy to take questions, I will research thoroughly and get back to you with an answer.

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